Witzel



E. wlTzEl.

May 2, l195() 'BURNER GONTROL SYSTEM AND CONTROL IIEANS THEREFOR FiledFeb. 9. 1948 2 Sheets-Sheet 2 www. L \NNN| @N AQNNI T Duw www H/.v 1mm,m, N. ANN. @"ull 'l 0 QN S mm] Y @j .QQ R. um

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Patented May:` 2, 1950 2,506,403 BURNER CONTROL SYSTEM AND CONTROL MEANSTHEREFOB Ernst Witxel, Milwaukee, Wis., assignor to Milwaukee. GasSpecialty Company,-Milwaukee, Wis., a corporation ol WisconsinApplication February s, 194s, serai Nn. un

1s claim.. (ol. 15s-111.1)

This invention relates to a burner control system and control means forsuch system.

While 'the particular embodiments of the invention which I shalldescribe hereinafter in connection with the drawings are systems adaptedfor use with domestic gas ranges, it is to be understood that theinvention is not limited to such use. but may be employed for allsimilar purposes; y

for example, inl connection with various commercial forms of apparatushaving a baking oven burner, broiler oven burner' or other burnerremotely located'relative tothe pilot burner.

In the usual domestic gas range, the pilot burner is in the form of asingle, constantly burning pilot burner located in juxtaposition to thetop burners at the upper part of the range, and the baking oven,broiler, or like burners are located in the lower part of the range.Although the top burners are usually provided with a constantly'burningpilot burner for lighting the same, a match has usually been employedfor lighting the baking oven, broiler, or like burners. The stooping andhazards of lighting an oven burner or the like with a match are wellknown in the art.

In my copending applications, Serial No. 738,412, illed March 31, 1947,and Serial No. 744,905, filed April 30, 1947, I provide an improvedsystem of ilash tubes and intermediate pilot burner meansvfor assuringignition of a pilot burner in juxtaposition to the oven or like burneryfrom a' constantly burning top pilot burner; also an improved systemwherein means is provided for extinguishing the intermediate pilotburner means and establishing a ilow of fuell to the oven or like burnerafter a time delay following ignition of the pilot burner for the mainburner, and

an improved thermoelectric control device andl other instrumentalitiesare provided for accomplishing the new and advan geous results thereinset forth.

One of the main objects of the present invention is to provide a simple,improved and effective system and means which will provide all of theadvantageous results obtained witlpthe systems disclosed and claimed inmy above identified co' pending applications but without the time delaymechanism for establishing a time delay between ignition of the pilotburner for themain burner and establishment of-a flow of fuelI to themain burner.

Another object of the invention is to provide an improved system of thecharacter described in which the diaphragm or equivalent means at thethermoelectric control valve, instead of being exposed to thedeleterious chemicals therein at all times, gas only when the gas cockor means is open.

Another object of the invention is to provide an is exposed to theothengas shut-oi! -improved system of the character ,described which maybe used with only one pilot burner instead of a plurality of pilotburners at the thermoelectric generator heating position, although not jlimited -to such use.

Another object of the invention is to provide an improved system of thecharacter described in which trouble free mechanism is provided foraccomplishing the desired results. Another object of the invention is toprovide an improved form of automatic or thermoelectric control valvehaving various features of novelty land advantages, and which ischaracterized by its simplicity in construction, its economy inmanufacture and installation, and its effectiveness in use; also a valveof this sort having a diaphragm or equivalent means with provision forexposing such diaphragm or equivalent means to the gas only when the gascock or other shut-oir means is open.

Anotherlobject of the invention is to provide an improved systemembodying a bleed port control, and, more particularly, a system of thissort wherein the automatic or thermoelectric control valve does notrequire special seals or the like.

Further objects and advantages of the invention will appear from thefollowing detailed description, taken in connection with theaccompanying drawings which illustrate the manner of constructing aandoperating illustrative embodiments of the invention.

In the drawings:

Figure 1 is a diagrammatic view showing a system embodying the presentinvention, with the thermoelectric control valve in section; and

Figure 2 is a similar View showing another system embodying the presentinvention; also with the thermoelectric control valve in section.

Referring first to the embodiment of the invention shown in Figure 1,the burner l is the baking oven, broiler, or other remote burner. It isusually located in the lower part of the range or other appliance. f

The pilot burner 2 is the constantly burning pilot burner. It may be,for example, the top pilot burner for the top burners of a gas range orother constantly burning pilot burner. lThe pilot burner 2 is usuallylocated in the upper part of the appliance.

A fuel supply pipe 3 leads, for example, from action of the gas and 5Igas manifold I to pilot burner 2 for the delivery embodiment cock 1 areconnected by suitable linkage shown bining of the valve spaced laterallyfrom the oven 4to.Y Internally the valve body valve, is in the form ofof gaseous fuel thereto. The iiow of fuel to the burner I is controlledby an automatic or thermoelectric control valve l and by a thermostatcontrolled valve 9 and a gas'cock 1 or other gas shut-oi! means. Thethermostat controlled valvelmaybeofanytypewellknownintheart, andtherefore will not be described in detail except to state that itoperates under the action of a thermostat to place the fuel supply pipe9, leading from the outlet 9 of the thermoelectric control valve l, incommunication with fuel supply pipe Il leading to the burner I and toshut of! communication between these pipes. The pipe Il is shown asadapted to supply the gaseous fue! to burner I through a mixing chamberto which air is admitted through adjustable air inlets (not shown), asweil understood 'in the art.

The gas cock 1 may also be any type well known in the art, andtherefore, likewise, will 'not be described in detail, exc pt to statethat it is operable, for example, 1n'V ually to place fuel supply pipeII. leading from manifold 4 to cock 1, in communication( with a fuelsupply pipe I2 which leads from the cock 1 and tol shut offcommunication between these pipes. In the illustrated of the` invention,the valve 5 and comprising meshed toothed sectors I3 and I4. The form oflinkage connection may vary, and com- 9 and cock 1 into a single deviceis contemplated within the scope of the present invention'. 3 The ovenor like burner I is provided with an oven or like pilot burner 'I5 forigniting it. A flash tube Il has a laterally turned upper end openingdirectly to the constantly burning pilot burner 2. This tube I9 extendsdownwardly and opens at its lower end to an intermediate pilot burnerI1. The intermediate pilot burner I1 is pilot burner I5, and the tube IIhas, at its lower end, a generally horizontally extending branch Ilwhich opens at its-outer end to the oven pilot burner I5. An auxiliaryor standby pilot burner I9 is also provided in lighting proximity to theburner I for a purpose which will hereinafter appear.

The thermoelectric control valve 5 comprises a valve body formed of topand bottom valve body parts 2l and 2I clamped together by screws -orother suitable means (not shown) with adiaphragm 22 therebetween. Thevalve body part 2l has an inlet 23 and the outlet 9. A fuel supply pipe24 leads from manifold 4 to the inlet 22 for the delivery of gaseous orother fuel therepart 29 has a generally L-shaped outlet chamber 25having a longitudinally extending part in open communication with theoutlet 9 and a transversely extending portion defined by a cylindricalwall 29. An inlet chamber 21, in open communication with the inlet 23. agenerally annular-shaped portion which embraces the cylindrical wall 25.

The wall' 29 terminates in an annular valve seat 21'. An armature 2l, ofdisc-like form, has a yielding or other suitable valve or valve facing29 adapted to seat against the seat 21' to shut off the now of gas frominlet 23 to outlet 9 through the chamber 25. A hood 30 is clamped to thevalve body part 25 by a union nut 3i, and ipreferably with a hood gasket32 therebetween.

In the illustrated embodiment of the invention, the means for operatingthe valve 29, and, moreL particularly, the means for opening this anelectromagnet comterminates at its inner end in' prising a, magnet frameor coil spool 99 and a coil 94. One side of the coil 94 is connected-by.a lead 25 to one side of a shown in the form of a thermopile 2l,although it may be in the form of va thermocouple or other suitablethermoelectric generator. The other side of the coil 94 is connected bya lead 21 to the other side of the thermoelectric generator 25,

although I contemplate grounding one side of lside of thethermoelectricv the coil 24 and one :generator where suitable landappropriate.

`the electromagnet by heating In the illustrated embodiment of theinvention, the electromagnet has a ilux shell 28 and a spacer ring 99.The lower end of the coil spool Il has an axial recess, and disposed inthis recess and interposed between spool 99 and armature 2l is a coiledspring 40 which operates to move the armature 29 to retracted positionand to seat the valve 29 on valve seat 21' when the electromagnet isdeenergized. Energization of of the hot junctio of the thermopile 25 issuillcient to lift the valve 29 to open position against the action ofthe spring 49. A hood spring 4I, interposed between the top of the spool22 and hood 2li, seats the shell 29 in the valve body part 20 at 4I.

LThe bottom of the valve body part 29 hasta recess 42 spaced inwardlyfrom its periphery. The pipe I2 connects with a leads to pilot burner I5for supplying gaseous fuel thereto, and with another branch pipe 44which leads to a chamber. which may, for example, be'cored in the valvebody part 20. A port 45 opens from the chamber 45 into chamber 41 abovethe diaphragm 22.

The valve body part 20 has a pilot outlet passage 49 for supplying fueltothe intermediate pilot burner I1 through a pipe 49. Fuel is adapt-'diaphragm and 41 to the passage 48' through a passage 50, the lowerendof which is surrounded by an annular valve seat 5I. A valve or valvefacing member 52 is adapted to seat against seat 5I to shut oif thesupply of fuel to the intermediate pilot burner I1. The'auxiliary orstandby pilot burner I9 is supplied with fuel by a. pipe 53 leading fromthe pipe 8, or otherwise from the outlet of the thermoelectric controlvalve 5.

Valve or valve facing 52, which is of disc-like form, is secured to thediaphragm 22 at the axis thereof. The diaphragm 22 may have diaphragmplates, and interposed between the bottom of this valve body part orcover plate 2I is a coiled spring 54. The Apart 2l has an axiallydisposed cup-shaped part 55 for accommodating the spring 54. A port 56opens from the outlet chamber 25 and through a port 51 into the chamber58 beneath the diaphragm 22.

The operation of the system shown in Figure 1 is as follows:

When the thermostat valve and gas cock combination is opened, gas willflow through the pipes II and I2 and branch off through pipe 43 tosupply fuel to the burner pilot burner I5. At the same time the otherbranch pipe 44 supplies gas through chamber 45 and port 46 to the top ofthe diaphragm 22, and thereby opens the valve 52 and supplies fuelthrough the passage 50, outlet passage 48, and pipe 49 to theintermediate pilot burner I1.

The gas from the intermediate and pilot burners I1 and I5 rises in thetube I5 which is always thermoelectric generator branch pipe 49 which'amaca dashes back to lis-ht the intermediate andfpllot burners I1 andI5. The turning of the upper end of the iiash tube I5 laterally towardthe pilot burner 2 reduces the possibility of extinguishing this pilotby ilash back action in the tube I5.'

The thermopile or other thermoelectric generator 55 is now heated by thepilot burner I5, and energizes the electromagnet 55, 25, which, after agiven time, will lift the amature 25 and, with it, valve 25, therebyopening the valve 25. Gas will now flow through the pipes 25 and 5,thermostat valve 5, and pipe I to the burner I; also through the pipe 55tothe auxiliary or standby pilot burner I5. As soon as the automaticvalve 5 opens, gas passes to the underI side of the' diaphragm 22through ports 56 and 51, and balances the pressure on opposite sidesofthe diaphragm.

` The spring 55 will now close valve l2, thereby s A fuel hereto- Thegas cock 51 is shown in closed position and is turned counterclockwisein the direction of the arrow to open position. Suitable passages (notshown) are provided in the gas cock 51 for delivering fuel fromitheinlet of the cock through the ports I5 and 15, and thereby to the pipes1| and "when the gas cock is open.

The ash tube I1 has a laterally turned upper end opening to theconstantly burning pilot burner 55. This tube extends downwardly andopens directly over a flash tube pilot burner in lightshutting oi!thesupply of gas to the intermediate pilot burner I1, which permitsilash tube I5 to cool for the succeeding starting operation.

When the thermostat-gasv cock 5, I isl closed,

the gas supply to the burner I is definitely shut oir: also the gassupply to the pilot burners II and I5. However, sas can still passthrough the pipe 25, valve 5, and pipe 55 to the auxiliary or standbypilot burner I5 which will remain lighted as long as the valve 5 isopen, which depends on the cooling rate of the thermoelectric generator55. vWhen finally the amature is released from the electromasnet 3l,fthe valve member 29 moves to closed position against valve seat 21 andshuts oi! the supply of Vfuel to the auxiliary or standby pilot burnerI5.

It is an important feature that the pilot burner I5 is standing by andmaintains a pilot flame for lighting the burner I as long as theautomatic valve 5 is open. In case the thermostat-gas cock 5, I isturned on before the thermoelectric generator 25 has cooled sumcientlyto close the valve 5, gas passing to the burner I will ignite from thestandby pilot burner I5; the intermediate pilot I'I being shut oi! orinoperative to produce lig-hting oi the burner I as long as the valve 5is open.

The present invention provides for accomplishing the results set forthwithout exposing the diaphragm 22 to gas at all times, which isobjectionable because oi' the deleterious eifect of the gas andchemicals therein on the diaphragm material. Instead of being exposed tothe gas atv all times, the diaphragm 22 is exposed to the gas only whenthe gas cock 'l or other shut-oi! means is open. The possibility ofdeveloping leaks and failure of the systemare thereby reduced.

The structure and operation of the automatic or thermoeleotric controlvalve 5 are also important aspects yof the present invention.

As usual, the safety shut-ofi' feature is present. If the pilot burner I5 should fail, the vthermoelectric generator 35 will cool and the valvemember 25 will operate to closed position.

In the system shown in Figure 2, the burner and constantly burning pilotburner shown diagrammatically at correspond with the burner I andconstantly burning .pilot burner 2 of the preceding embodiment of theinvention.

65 and has a port 'I0 for delivering gaseous fuel to a pipe 1I leadingtothe inlet 'I2 of the lautomatic or thermoelectric control valve15;.and a second port 'I5 for delivering fuel to a pipe 15 leading to apilot burner 15 for supplying gaseous ing proximity to theburner 55.'I'he auxiliary or standby pilot burnerA 'I5 is also in lightingproximity to the burner 55. Y

The automatic or thermoelectric control valve I5 comprises a valve bodyformed of top and bottom valve body parts 55 and 5|, clamped .to-

gether as suitable or desired, with a diaphragm 52 therebetween. Thevalve body part 5I Vhas the inlet l2 and an outlet 55.- The outlet 551sadapted to supply gaseous fuel to the bin-ner 55 through a pipe 54. forexample, through a mixing vchamber 55 to which air is admitted throughadjustable air inlets (not shown).

Within the valve body part 5| thereare chambers 55 and 51 between whichthere is a passage 55 having valve seats 55 and 55 at the opposite endsthereof. 'I'he inlet |2.of the valve 'I3 opens into the passage 55intermediate the valve seats 55 and 55 at opposite ends thereof. A pipeor tube 5I `leads from the chamber 55 to the pilot burner 15.

Secured to the diaphragm 52 at the axis thereof is a,valve stem 54having a valve or yielding facing 55 adapted to seat against the seat 55to shut oi! the supply of fuel to the pilot burner 15. 'Ihe valve stem55 also carries a second valve or yielding valve facing 55 adapted toseat against the s eat 55 to shut oir the supply of fuel to the burner55.

The bleed port control comprises abody 'part 51 mounted, for example, onthe valve body part 55 and provided withy a chamber 55. A pipe 55,leading from the pipe 55 or, if desired, from the gas cock 51, isadapted'to deliverl gaseous fuel` fuel vented through the port |52 ispreferably delivered through a pipe |03 to position adjacent to theburner 55 where it is burned. 'I'he ports 55' and |02 are controlled byvalve members I 55 and |05 carried 'by a generally T-shaped arm |55pivoted at I01.

In the illustrated embodiment of the invention the means for operatingthe arm |55, and thereb'y the valves |54 and |55, is in the fonn of anelectromagnet comprising a magnet frame |55 and a coll |05. One side ofthe coil |55 is connected by a lead I5 to one side of the thermoelectricgenerator 53. The other side of the coil |55 is connected by alead IIIto the other side of the thermoelectric generator 55. As before, Icontemplate grounding one side of the coil |55 and one side of thethermoelectric generator 55 and omitting one of the leads |I5 or IIIwhere suitable and appropriate.

The amature H2 is carried by an arm III pivotally mounted at one end atH5. The opposite end of the arm IIB is connected by a link |I5 with theoutwardly extending arm II5 oi' the arm or lever |05. A spring Ill,connected, for example, between the arm I5 andv the bodycounterclockwise armature to retracted position to close valve |88 1part 81, is adapted to actuatethe arm |`l8 in a direction and therebythe and open valve ill. The connections of the arms ||8 and ||8 with theopposite ends of the link ||8 are, of course, such asV to permit thedesired action.

With the mechanism in the position shown in Figure 2, the operation ofthis form of system is as follows:

When the gas cock 91 is opened, gas will flow .through the port 'Il andpipe 'Il t0 inlet '12 of valve 18 and into the passage 88. Valve 98being closed, there is no flow of gas to the burner Il, but valve 9|being held open by spring 98', gas flows into the chamber 80 andoutthrough the pipe 9i to the pilot burner 18. Pilot burner 18 ignites fromthe top pilot burner 00 by means of the flash tube 11. At the same time,gas flows through the port 18 and pipe 1I to the pilot burner 18 whichignites from pilot burner 18.

' The thermoelectric generator 98 is now heated by the pilot burner 18and energizes electromagnet |88, |09 which, after a given time, willmove the armature ||2 to attracted position, swinging arm ||8 in aclockwise direction and also swinging arm |08 in a` clockwise directionto open valve |84 and close vent valve |00. Gas will now ilow throughpipe 99 and port 99' into chamber 98, and from' chamber 90 through port|88 into chamber lli. The action of the gas pressure in chamber on thelarge area of the diaphragm 82 flexes the diaphragm downwardly, therebyclosing valve 95 and opening valve 90. As soon as valve 99 opens, gaspasses to the burner 05 which is ignited by the adjacent pilot. As gasenters the chamber |0| it is delivered through a tube or pipe |8 to theauxiliary or standby'pilot burner 19 which ignites. When the valve 9icloses, it shuts off the gas supply m to the pilot burner 10.

When the gas cock 01 is closed the gas supply to the burner 05 isdefinitely shut off; also the gas supply to the pilot burner 19 is shutoff. However, gas can still. pass through pipe 99, port 98', chamber 88,port |00, chamber |0| and pipe ||8 to the auxiliary or standby pilotburner 19 which will remain lighted as long as the valve |88 is open andvent valve |05 is closed, which depends on the cooling rate of thethermoelectric generator 98. When finally the armature |I2 is releasedfrom the electromagnet |08, |99, the valve member |08 closes and ventvalve |00 opens under the action of thespring ||1. This shuts of! thesupply of fuel to the auxiliary or standby pilot burner. The gas inchamber 98 escapes through the pipe |83 and may be burned by the flame.for example, at pilot burner 19 which will remain lighted until the gasin chamber |0| is exhausted.

The embodiment of the invention shown in Figure 2 provides theadvantageous results set forth in more detail in connection with thePreceding embodiment of the invention.

Many other variations and adaptations of the 08 systems and devicesselected for illustration are contemplated within the scope of thepresent invention. `Therefore the embodiments of the invention shown inthe drawings are for illustrative purposes only, and it is to beexpressly understood that the drawings and the accompanying specicationsare not to be constructed as a deflnition of the limits or scope of theinvention, reference being had to the appended claims for that purpose.

8 I claim: i. In apparatus of the class described. in oombination, athermoelectric control device having a fuel inlet and a fuel outlet, afirst valve mem- 5 ber for shutting olf communication between said inletand said outlet, said control device having a valve body provided with apair of chambers separated by a diaphragm. a pilot fuel outlet means onone side Voi! said diaphragm, a

lo first intermediate pilot burner connected to said pilot fuel outlet,a second constantly burning pilot burner, a main burner remote from saidiirst constantly burning pilot burner, a third pilot burner for ignitingsaid main burner, a

flash tube for igniting said first intermediate pilot burner and saidthird pilot burner from said second constantly burning pilot burner, asecond valve member for controlling said pilot fuel outlet and actuatedto open position by 20 said diaphragm, port means for delivering fuelinto the chamber on one side of said Ydiaphragm independently of thefuel inlet of the valve body for actuating said diaphragm in a directionto open the valve member for the pilot outlet when said first valvemember is closed, port means for delivering fuel into the chamber on theopposite side of the .diaphragm to equalize the fuel pressure in thechambers `on opposite sides of the diaphragm when said first valvemember is open, means for actuating said diaphragm in a direction toclose said second valve member upon I equalization of pressure uponopposite sides of the diaphragm, and a standby pilot burner injuxtaposition to the burner and connected to 5 the fuel outlet of thevalve body of said thermoelectric valve.

2. Apparatus according to claim 1 wherein there is a fuel supply lineleading to the port means for delivering fuel into the chamber on oneside of the diaphragm independently of the fuel inlet of thethermoelectric control device, and fuel shut-off means in said fuelsupply line anterior of said port means.

lEl. Apparatus according to claim l where there is a fuel supply lineleading to the port s means for delivering fuel into the chamber on oneside of the diaphragm independently of the fuel inlet of thethermoelectric control device; also fuel shut-off means. in said fuelsupply line anterior of said port means, and a branch fuel 5 une leadingfrom said last mentioned fuel une to said third pilot burner.

4. Apparatus according to claim 1 wherein there is a fuel supply lineleading from the outlet of said thermoelectric control device to theburner'with' a thermostat controlled valve in said last supply line.

5. Apparatus according to claim 1 wherein there is a fuel supply lineleading to the port means for delivering fuel into the chamber on oneside of the diaphragm independently ci the fuel inlet of thethermoelectric control device, with fuel shut-off means in said fuelsupply line' anterior of said port means and wherein there is a fuelsupply line leading from the outlet of said thermoelectric controldevice to the burner, with a thermostat controlled valve in said lastfuel supply line. Y

6. In a thermoelectric control device, in combination, a valve bodyhaving a fuel inlet and 7 a fuel outlet, said valve body having apassage open to said fuel inlet and having valve seats at its oppositeends. a diaphragm carrying a pairA of valve members, one adapted to seatagainst one valve seat and the other adapted to. seat against the othervalve seat, said valve lbody having a first chamber posterior of one toLclaim 6 wherein there is a bleed chamber open-4 ing into said secondchamber, with a port opening into' said bleed chamber for deliveringfuel into said chamber, a bleed port opening from said bleed chamber toatmosphere, and thermoelectrically controlled valve means controllingsaidports. j

8. A thermoelectriccontrol device according to claim 6 wherein there isa bleed chamber opening .intosaid second chamber, with a port openinginto said bleed chamber for delivering fuel into said chamber, a bleedport opening from said bleed chamber to atmosphere, thermoelectricallycontrolled valve means controlling said ports,l said thermoelectricallycontrolled valve means comprising a pivoted lever having a pair of valvemembers one for each of said ports, and an electromagnet for actuatingsaid lever to and holding it in position with the valve member for thebleed port closed and the valve member for the other port open. y

9. In a burner control system of the class wherein there is a mainburner, pilot burner means for lighting said main burner, said pilotburner means comprising a first pilot burner, a fuel supply line forsupplying fuel to said main burner, a fuel supply line for supplyingfuel to said first pilot burner, a safety shutoff valve in of fuel tosaid main burner, valve means in the shutoff valve in the fuel supplyline for the main the fuel supply line for the main burner and operableto closed position to shut oil! the supplyv burner is open, whereby toshut off the supply 4 of fuel to said first pilot burner, thecombination with said system of stand-by pilot burner means injuxtaposition to the main lburner for relighting said main burner whenthe safety shutoff valve in the fuel supply line to the main burner isin open position and the valve means in the fuel supply line for saidfirst pilot burner is closed.

burners.

for said second'pilot burner and additional valve means partially in thefuel supply line for the main burner and partially in the fuel supplyline for one of the pilot burners, said additional valve means beingoperable.to closed position simultaneously to shut oil.' the supply offuel to both the main burner and one of said pilot burners and to openposition simultaneously to establish a supply of fuel to said mainburner and to one of said pilot burners.

13. A burner control system accordingtoclaim 9 wherein the pilot burnermeans comprises a second pilot burner and fuel supply means therefor inaddition to said flrst pilot burner, wherein the safety shutoff valve inthe fuel supply line for the main burner is under the control of anelectromagnet connected in circuit with al thermoelectric generatorsubject to the heat of said second pilot burner, and wherein there is athermostat controlled valve and a connected gas cock for controlling thesupply of fuel to the main burner and to said first and 14. A burnercontrol system according to claim 9 wherein the safety shuto' valve inthel fuel supply line for the main burner comprises a valve body havingan outlet port for supplying fuel to said first pilot burner, andwherein there is a fuel supply means for said outlet port and va valvemember under the control of the safety shutoff valve for controlling thesupply of fuel through said fuel supply means to said port.

15. In a control device of the class described.

in combination, a pilot burner, a valve body having a nrst fuel inletand a first fuel outlet. a

first valve member for shutting off communication between said inlet andsaid outlet, said valve body having a first chamber and a second chamberseparated by a diaphragm, with said chambers disposed on opposite sidesof the diaphragm, said valve body having a second fuel outlet forsupplying fuel to said pilot burner, a second' valve member forcontrolling. said second fuel i outlet and operable to open position byduid -pressure in said first chamber for supply of fuel to said secondfuel outlet when said first valve member is closed, said valve bodyhaving port means for delivering fuel into said first cham# berindependently of said first fuel inlet for actuating said diaphragm in adirection to open said second valve member, said valve body havingadditional port means for delivering fuel into said second chamber fromsaid first fuel outlet when said first valve member is open to equalizethe fuel pressure in the' chambers on opposite sides of the diaphragm.and means for actuating said diaphragm in a direction to close 10. Aburner control system according to claim through said port means foractuating the valve means in the fuel supply line for said first pilotburner to open position upon closing of the safety shutoff valve in thefuel supply line for the main burner.

11. A burner control system according to claim 9 wherein the safetyshutoff valve in the fuel supply line for the main burner is under thecontrol of an electromagnet connected in circuit with a thermoelectricgenerator subject to the heat of said pilot burner means.

12. A burner control system according to claim 9 wherein the pilotburner means comprises a second pilot burner in addition to said firstpilot said second valve member upon equalization of pressure uponopposite sides of the diaphragm.

16. In apparatus of the class described, incombination, a control devicecomprising a valve body having a first fuel inlet and a first fueloutlet, a first safety valve member for shutting off communicationbetween said rst fuel inlet and said first fuel outlet, said valve .bodyhaving a first chamber and a second chamber separated by a diaphragm,with said chambers disposed on opposite sides of said diaphragm, saidvalve body having a second fuel outlet, a nrst pilot burner connected toreceive fuel from said second fuel outlet, a second valve member forcontrolling said second fuel outlet and operable to openposition by fuelpressure in said first chamber for supply of fuel to said second fueloutlet when said first valve member is closed,

burner, and wherein there is a fuel supply line 1I said valve bodyhaving first port means for desecond pilot ently of said first fuelinlet for actuating said ,diaphragm in a direction to open said secondvalve member, said valve body having second port means for deliveringfuel into said second chamber from said first fuel outlet when saidfirst valve member is open to equalize the fuel pressure on oppositesides of the diaphragm, means for actuating said diaphragm in adirection to close said second valve member upon equalization ofpressure on opposite sides of the diaphragm, a second pilot burner, afirst fuel supply line leading to said rst port means and to said secondpilot burner /for supplying fuel thereto, a third stand-by pilot burner,a iain burner, a second fuel supply line leading through the valve bodyof said control device to said main burner and 'to said third stand-bypilot burner for supplying fuel thereto, a first shutoff valve in saidfirst fuel supply lineanterior of said first port means and said secondpilot burner, and a second shutoff valve "terconnected with said firstshutoff valve forfoperation therewith and disposed in said second fuelsupply line posterior to the first safety' valve member of said controldevice.

17. Apparatus according to claim 16, wherein the first safety valve ofsaid control device is under the control of an electromagnet connectedin circuit with a thermoelectric generator subject to the heat of thefirst pilot burner.

18. In apparatus of the class described, in combination, a main burner,a fuel supply line for supplying fuel to said main burner. a first pilotburner, a safety shutoff valve in thefuel supply line for said mainburner, said safety shut off valve having a fuel inlet and a fueloutlet, an electromagnet connected in circuit with a thermoelectricgenerator subject to the heat of said first pilot .burner and operableto maintain said safety shutoi! valve open when said first pilot burneris ignited and to release said safety shutoff valve for operation toclosed position when said rst pilot burner is extin- 12 guished, asecond stand-by pilot burner in luxtaposition to said main burner, and afuel supply line for maintaining a supply of fuel to said secondstand-by pilot burner from the fuel outlet of the safety shutoil valvein the fuel supply line for the main burner, whereby to maintain saidsecond stand-by pilot burner ignited if said safety shutoff valveremains open after said first pilot burner is extinguishedsaid safetyshutoff valve in the fuelsupplyline for the main burner being arrangedso that when in closed position it shuts off the supply of fuel to bothsaid main burner and to said stand-by pilot burner.

' 19. Apparatus according to claim 18 wherein there is additionalshutoff means in the fuel supply line leading to the main burner and inthe fuel supply line leading to said ilrst pilot burner, whichadditional shutoff means is adapted to shut ofL the supply of fuel toboth the main burner 'and the first pilot burner and is capable of beingopened to reestablish a supply of fuel to the main burner and to thefirst pilot burner without ignition of said first pilot burner, theadditional shutoff means in the fuel supply line leading to the mainburner being disposedk between the fuel outlet of the safety shutoffvalve and the main burner.

ERNST WITZEL.

REFERENCES CITED The following references are of record in the illeofthis patent:

UNITED STATES PATENTS Number Name Date 2,063,834 Bast et al Dec. 8, 19362,072,034 Geurink et al. Feb. 23, 193'! 2,261,092 Peterson Oct. 28, 19412,273,127 McGoldrick et al. Feb. 17, 1942 2,291,567 Wunsch et a1. July28, 1942 2,292,477 Ray Aug. 11, 1942 2,294,694 Ray Sept. 1. 19422,384,696 Ray l Sept. 11, 1945 2,437,894 Ray a Mar. 16, 1948 Disclaimer2,506,403.Emst Wz'tzel, Milwaukee, Wis. BURNER CONTROL SYSTEM ANDCONTROL MEANS THEREFOR. Patent dated May 2, 1950. Disclaimer Mz'Zwa/aveeGas Specialty Company.

led Apr. 6, 1951,10y the assignee,

9, 11, and 14 of said patent..

Hereby enters this disclaimer tO claims [Oycz'al Gazette May 8, 1.951.]

